1. The only absolute contraindication to hyperbaric oxygen therapy is untreated pneumothorax . 2. While in residence in Marseille he wrote a thesis on pneumothorax . 3. Pneumothorax occurs in less than 1 % of lung biopsy cases.4. This was the way that pneumothorax or lung compression was accomplished. 5. The most frequently reported adverse events were pneumothorax and infections. 6. Complications of MAS include pneumothorax and persistent pulmonary hypertension of the newborn. 7. Death from pneumothorax is very uncommon ( except in tension pneumothoraces ). 8. The individual may develop a pneumothorax , or collapse of the lung. 9. Complications may include hemorrhage, subcutaneous emphysema, pneumomediastinum, and pneumothorax . 10. It is most commonly used to help remove air from a pneumothorax .